'Ultimate wheel customisation'. That's what SCS is promising (opens in new tab) Euro- and American Truck Simulator (opens in new tab) players will accompany Steam Workshop support (opens in new tab) in the next patch.
Recently, the tyres and discs of your big rigs were split into separate components. SCS is extending the system to include hubs, hubcaps and nuts. That'll arrive for both games simultaneously, although the patch isn't dated yet.
After that, the options will be expanded still further with "a small but cool DLC", packing far-out nut designs and paintable components. Quite a nice complement for Euro Truck Simulator (opens in new tab)'s multiplayer mod, I'll wager.